Solar window charger for two batteries?
Is there such a thing as a solar charger that can charge two batteries, swap to a safe float charge when done yet sit inside the RV? Or at least a battery tender that will hold the charge? The batte...
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If you are willing to take the dent in the wallet (they are $2/watt as opposed to conventional panels which are .75/watt) and a dent in efficiency, there are flexible solar panels that don't need a frame, and just attach to the roof with tape and caulk. That and a MPPT controller (I always recommend MPPT for the ability to capture every last watt from the limited space available for panels) will go a ways to keeping batteries charged. Given space, 100 watts is minimum, but ideally, 200-300 watts would be what one should look at (rule of thumb -- match the panel wattage to the total amp-hours of your battery bank. Not perfect, but effective.)
Of course, there is the option to have a fold-up stand with some panels on that. That will get you 100-200 watts depending on panels. However, once you get roof panels that handle the job regardless, it is hard to go with other means.
Of course, there is the option to have a fold-up stand with some panels on that. That will get you 100-200 watts depending on panels. However, once you get roof panels that handle the job regardless, it is hard to go with other means.
